Dell Force10 S55T S55 Configuration Guide FTOS 8.3.5.3 - Page 749
Con NTP authentication, show running-config ntp Command Example, FTOS Behavior
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Configure NTP authentication NTP authentication and the corresponding trusted key provide a reliable means of exchanging NTP packets with trusted time sources. NTP authentication begins when the first NTP packet is created following the configuration of keys. NTP authentication in FTOS uses the MD5 algorithm and the key is embedded in the synchronization packet that is sent to an NTP time source. FTOS Behavior: FTOS versions 8.2.1.0 and later use an encryption algorithm to store the authentication key that is different from previous FTOS versions; beginning in version 8.2.1.0, FTOS uses DES encryption to store the key in the startup-config when you enter the command ntp authentication-key. Therefore, if your system boots with a startup-configuration from an FTOS versions prior to 8.2.1.0 in which you have configured ntp authentication-key, the system cannot correctly decrypt the key, and cannot authenticate NTP packets. In this case you must re-enter this command and save the running-config to the startup-config. To configure NTP authentication, use these commands in the following sequence in the CONFIGURATION mode: Step 1 2 3 Command Syntax ntp authenticate ntp authentication-key number md5 key ntp trusted-key number Command Mode CONFIGURATION CONFIGURATION CONFIGURATION Purpose Enable NTP authentication. Set an authentication key. Configure the following parameters: number: Range 1 to 4294967295. This number must be the same as the number in the ntp trusted-key command. key: Enter a text string. This text string is encrypted. Define a trusted key. Configure a number from 1 to 4294967295. The number must be the same as the number used in the ntp authentication-key command. To view the NTP configuration, use the show running-config ntp command (Figure 40) in the EXEC privilege mode. Figure 42-5 shows an encrypted authentication key. All keys are encrypted. Figure 42-5. show running-config ntp Command Example Force10#show running ntp ! ntp authenticate ntp authentication-key 345 md5 5A60910F3D211F02 ntp server 11.1.1.1 version 3 ntp trusted-key 345 Force10# encrypted key System Time and Date | 749
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